Supplemental Cash Flow Information -Summary Of Detailed Information About Non Cash Investing And Financing Activities (Detail ) - CAD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Text block [abstract]
Capitalized share-based payments	$ 6,867	$ 6,364
Exploration and evaluation asset expenditures included in accounts payable and accrued liabilities	10,929	4,711
Interest expense included in accounts payable and accrued liabilities	$ 773	$ 85

Exploration and evaluation asset expenditures included in accounts payable and accrued liabilities.

No definition available.

Name:	nxe_ExplorationAndEvaluationAssetExpendituresIncludedInAccountsPayableAndAccruedLiabilities
Namespace Prefix:	nxe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration